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A comprehensive variable temperature study of the layered oxide, Ca2Mn3O8

Vera Stimpson, Laura J, McNulty, Jason A., Morrison, Finlay D., Mahajan, Amit, McCabe, Emma E., Gibbs, Alexandra, Stenning, Gavin B.G., Jura, Marek, Arnold, Donna C. (2020) A comprehensive variable temperature study of the layered oxide, Ca2Mn3O8. Journal of Alloys and Compounds, . ISSN 0925-8388. (doi:10.1016/j.jallcom.2020.155633) (KAR id:81676)

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Ca2Mn3O8 forms a delafossite-related layered structure, which crystallises with monoclinic C2/m symmetry. Compared with the delafossite-structure, the MnO6 layers in Ca2Mn3O8 exhibit an ordered cation void which forms a magnetic ‘bow-tie’ like connectivity of Mn4+ ion layers separated by Ca2+ ions. In-situ variable temperature diffraction data demonstrates that the structure is robust up to a temperature of approximately 1173 K before the material decomposes into the perovskite, CaMnO3 and marokite, CaMn2O4 phases. Simultaneous thermal analysis suggests that a very small amount of water remains within the layers post synthesis. Impedance spectroscopy indicates that Ca2Mn3O8 is an electronic conductor in the range ∼400–700 K with an activation energy of 0.50 ± 0.01 eV.

Item Type: Article
DOI/Identification number: 10.1016/j.jallcom.2020.155633
Uncontrolled keywords: Materials for Energy and Electronics, Layered oxides, Neutron diffraction, Electronic measurements
Divisions: Divisions > Division of Natural Sciences > School of Physical Sciences
Depositing User: Donna Arnold
Date Deposited: 12 Jun 2020 09:18 UTC
Last Modified: 11 Jun 2021 23:00 UTC
Resource URI: (The current URI for this page, for reference purposes)
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